Re: TI-H: Talk 85


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Re: TI-H: Talk 85



maybe people should define what they mean by a clock..
>On Sat, 9 Nov 1996, Tony Lieuallen wrote:
>
>> The file you attached is about doing it yourself via ASM.  When I 
>> referred to there being a clock signal, I meant in the way that TI does 
>> it the way it's built into the calc, and I am 99% sure that that is correct.
>
>Let me be the first to assure you that you are wrong. The TI does not use
>a clock line in its link protocol.
>
>One line is DATA, the other line is ACK (for ACKnowledge). Which line is
>which depends on the state (1 or 0) of the bit being sent.
>
>Essentially, to send a bit of information, the calculators do as follows:
>
>Sending calc pulls one line to ground (which line is pulled depends on
>which logical bit is sent. I believe pulling red signifies 0 (and white =
>1).  The recieving calculator ACKnowleges the bit by pulling the other
>line (i.e. whichever line is still at 5v) to ground. When the sending calc
>sees that both lines are at 0v, it resets both lines to +5v.
>
>The process is repeated for each bit sent.
>
>-Isaac
>
>--
>Isaac Salpeter
>the ticalc.org project
>isaac@ticalc.org
>--
>
>
>
>


	David Lee
>>POINT FOUR TECHNOLOGIES<<




  


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